About 1.3TB, but perhaps a lot of dupes there since I don`t keep it too organized. Not a big deal to get a decent storage today. Just buy like 4 x 4TB disks make it RAID5 and You have 12TB of relatively sturdy storage. Unless You collect too much HD stuff You will never run out of space. Yes I know there are safer ways to store Your data than HDDs, but hey, its just a porn! 
